Building containerized applications require a lot of configurations. If you are building a Java application and planning to use Docker, you might need to consider Jib. Jib is an opensource plugin for Maven and Gradle. It uses the build information to build a Docker image without requiring a Dockerfile and Docker daemon. In this article, we will build a simple Spring Boot application with Jib Maven configuration to see Jib in action. The pom.xml configuration with Jib is given below.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.5.RELEASE</version>
<relativePath />
<!-- lookup parent from repository -->
</parent>
<groupId>org.smarttechie</groupId>
<artifactId>jib-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>jib-demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<!-- The below configuration is for Jib -->
<build>
<plugins>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>jib-maven-plugin</artifactId>
<version>2.1.0</version>
<configuration>
<to>
<!-- I configured Docker Image to be pushed to DockerHub -->
<image>2013techsmarts/jib-demo</image>
</to>
<auth>
<!-- Used simple Auth mechanism to authorize DockerHub Push -->
<username>xxxxxxxxx</username>
<password>xxxxxxxxx</password>
</auth>
</configuration>
</plugin>
</plugins>
</build>
</project>
After the above change, use the below Maven command to build the image and push that image to DockerHub. If you face any authentication issues with DockerHub, refer https://github.com/GoogleContainerTools/jib/tree/master/jib-maven-plugin#authentication-methods
mvn compile jib:build
Now, pull the image which we created with the above command to run it.
docker image pull 2013techsmarts/jib-demo docker run -p 8080:8080 2013techsmarts/jib-demo
That’s it. No more additional skill is required to create a Docker Image.
Published on Java Code Geeks with permission by Siva Janapati, partner at our JCG program. See the original article here: Jib – Containerize Your Java Application Opinions expressed by Java Code Geeks contributors are their own. |
